Poly(vinyl alcohol) and ethylene-vinyl alcohol copolymers have been phosphorylated with H3PO 4 and H3PO 3. The phosphorylated samples possess pendent phosphate and phosphite groups and are significantly more flame retardant than the unmodified materials. The flame retardance arises in part from a condensed-phase mechanism involving dehydration, crosslinking and intumescent char formation, similar to that observed when certain phosphorus-based additives are used with poly(vinyl alcohol), cellulose and other highly hydroxylated polymers, and in part from a vapour-phase mechanism. Low-density polyethylene can also be rendered flame retardant to a certain extent by phosphonylation
Посилання на статтю:
Influence of covalently bound phosphorus-containing groups on the flammability of poly(vinyl alcohol), poly(ethylene-co-vinyl alcohol) and low-density polyethylene / Mavis Banks, John R. Ebdon* and Michael Johnson // Polymer. – 1993. – Vol 34. – P. 4547-4556.